Impact of Early Formwork Removal on Concrete Drying and Chloride Ion Diffusion

Abstract

Contractors are interested in removing and reusing the formwork from concrete walls as soon as possible to speed up construction. While the concrete may have sufficient strength, there is little information about the impact on the durability of the concrete if the forms are removed at early ages. Curing is known to maintain the concrete moisture and promote hydration to create a denser microstructure. This research investigates the type of forms, formwork removal timing, and the impact of subsequent curing methods on the drying rate and ion penetration of concrete. This study shows that early form removal does impact the durability of the concrete and subsequent usage of curing compounds or plastic can extend the curing and improve the durability of the concrete. This work quantifies the differences and provides practical recommendations for the concrete industry.